Description of problem:
The oom killer is continuing to kill other processes, while a process previously selected by oom killer is already freeing its memory. Meaning, oom killer kills more and innocent tasks.
Version-Release number of selected component (if applicable):
kernel-2.6.32-174.el6 and newer
How reproducible:
Create a simple mem hog process and the oom killer will kill it along with another innocent process.
Steps to Reproduce:
1. swapoff -a
2. echo 1 > /proc/sys/vm/overcommit_memory
3. run mem hog process
Actual results:
The mem hog process is killed along with another innocent processes.
Expected results:
Only the mem hog process is killed.
Additional info:
Fixed by the following upstream commit:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c027a474a68065391c8773f6e83ed5412657e369

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update release.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHSA-2011-1530.html